There is also an other distinction of the names of triangles, according to their sides, whiche other be all equal as in the figure E, and that the Greekes doo call Isopleuron, ἰσόπλευρομ. and Latine men æequilaterum: and in english it may be called a threlike triangle, other els two sydes bee equall and the thyrd vnequall, which the Greekes call Isosceles, ισόσκελεσ. the Latine men æquicurio, and in english tweyleke may they be called, as in G, H, and K. For, they may be of iij. kinds that is to say, with one square angle, as is G, or with a blunte corner as H, or with all in sharpe korners, as you see in K.
Further more it may be yt they haue neuer a one syde equall to an other, and they be in iij kyndes also distinct lyke the twilekes, as you maye perceaue by these examples .M. N, and O. where M. hath a right angle, N, a blunte angle, and O, all sharpe angles σκαλενὄμ. these the Greekes and latine men do
cal scalena and in englishe theye may be called nouelekes, for thei haue no side equall, or like lõg, to ani other in the same figur. Here it is to be noted, that in a triãgle al the angles bee called innerãgles except ani side bee drawenne forth in lengthe, for then is that fourthe corner caled an vtter corner, as in this exãple because A.B, is drawen in length, therfore the ãgle C, is called an vtter ãgle.
Quadrãgle And thus haue I done with triãguled figures, and nowe foloweth quadrangles, which are figures of iiij. corners and of iiij. lines also, of whiche there be diuers kindes, but chiefely v. that is to say, A square quadrate. a square quadrate, whose sides bee all equall, and al the angles square, as you se here in this figure Q. A longe square. The second kind is called a long square, whose foure corners be all square, but the sides are not equall eche to other, yet is euery side equall to that other that is against it, as you maye perceaue in this figure .R.
